tree-wide: remove Emacs lines from all files This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.
basic: include only what we use This is a cleaned up result of running iwyu but without forward declarations on src/basic.
util-lib: move character class definitions to string-util.h
util-lib: split out allocation calls into alloc-util.[ch]
build-sys: split internal basic/ library from shared/ basic/ can be used by everything cannot use anything outside of basic/ libsystemd/ can use basic/ cannot use shared/ shared/ can use libsystemd/